package yns.springboot.guide.demo.task;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

@Configuration
public class TaskPoolConfig  {
	
	private final Logger logger = LoggerFactory.getLogger(this.getClass());
	
    @Bean("taskExecutor")
    public Executor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(10); //核心线程数 : 线程池创建时候初始化的线程数
        executor.setMaxPoolSize(20);   //最大线程数 : 线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
        executor.setQueueCapacity(200);  //缓冲队列 : 用来缓冲执行任务的队列
        executor.setKeepAliveSeconds(60);  //允许线程的空闲时间 : 当超过了核心线程出之外的线程在空闲时间到达之后会被销毁
        executor.setThreadNamePrefix("taskExecutor-"); //线程池名的前缀 : 方便定位处理任务所在的线程池
       
        //线程池对拒绝任务的处理策略：这里采用了CallerRunsPolicy策略，当线程池没有处理能力的时候，
        //该策略会直接在 execute 方法的调用线程中运行被拒绝的任务；如果执行程序已关闭，则会丢弃该任务
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        
        return executor;
    }

}
